1/*
2 * Copyright (C) 2017 Yusuke Suzuki <[email protected]>
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include <wtf/CPUTime.h>
28
29#include <sys/resource.h>
30#include <sys/time.h>
31#include <time.h>
32#include <wtf/Optional.h>
33
34namespace WTF {
35
36static Seconds timevalToSeconds(const struct timeval& value)
37{
38 return Seconds(value.tv_sec) + Seconds::fromMicroseconds(value.tv_usec);
39}
40
41Optional<CPUTime> CPUTime::get()
42{
43 struct rusage resource { };
44 int ret = getrusage(RUSAGE_SELF, &resource);
45 ASSERT_UNUSED(ret, !ret);
46 return CPUTime { MonotonicTime::now(), timevalToSeconds(resource.ru_utime), timevalToSeconds(resource.ru_stime) };
47}
48
49Seconds CPUTime::forCurrentThread()
50{
51 struct timespec ts { };
52 int ret = clock_gettime(CLOCK_THREAD_CPUTIME_ID, &ts);
53 RELEASE_ASSERT(!ret);
54 return Seconds(ts.tv_sec) + Seconds::fromNanoseconds(ts.tv_nsec);
55}
56
57}
58